Twilight of Arnor, check it out:
http://www.gamespot.com/pc/strategy/galacticcivilizationsiitwilightofthearnor/news.html?sid=6177058
I think biggest addition:
Unique tech trees for each race.
http://www.gamespot.com/pc/strategy/galacticcivilizationsiitwilightofthearnor/news.html?sid=6177058
I think biggest addition:
Unique tech trees for each race.
Of course it really depends on how deep they take this. If they just renamed the techs and call it civ specific techs then I'd be dissapointed.